diff --git a/docs/uncompiled/artplayer-plugin-multiple-subtitles/index.js b/docs/uncompiled/artplayer-plugin-multiple-subtitles/index.js
index ec4dcbeda..f2491e03d 100644
--- a/docs/uncompiled/artplayer-plugin-multiple-subtitles/index.js
+++ b/docs/uncompiled/artplayer-plugin-multiple-subtitles/index.js
@@ -178,22 +178,7 @@ function mergeTrees(trees) {
                 }
             }
         }
-        if (result.cues.length === 0) result.cues = [
-            ...tree.cues
-        ];
-        else for(let l = 0; l < result.cues.length; l++){
-            const a = result.cues[l].tree.children;
-            const b = tree.cues[l]?.tree?.children;
-            result.cues[l] = {
-                ...result.cues[l],
-                tree: {
-                    children: [
-                        ...a,
-                        ...b
-                    ]
-                }
-            };
-        }
+        result.cues.push(...tree.cues);
     }
     return result;
 }
@@ -246,9 +231,6 @@ function artplayerPluginMultipleSubtitles({ subtitles = [] }) {
         };
     };
 }
-artplayerPluginMultipleSubtitles.env = "development";
-artplayerPluginMultipleSubtitles.version = "1.0.0";
-artplayerPluginMultipleSubtitles.build = "2023-11-24 09:22:00";
 if (typeof window !== "undefined") window["artplayerPluginMultipleSubtitles"] = artplayerPluginMultipleSubtitles;
 
 },{"./parser":"eko7u","@parcel/transformer-js/src/esmodule-helpers.js":"5dUr6"}],"eko7u":[function(require,module,exports) {
@@ -978,7 +960,7 @@ exports.defineInteropFlag = function(a) {
 };
 exports.exportAll = function(source, dest) {
     Object.keys(source).forEach(function(key) {
-        if (key === "default" || key === "__esModule" || dest.hasOwnProperty(key)) return;
+        if (key === "default" || key === "__esModule" || Object.prototype.hasOwnProperty.call(dest, key)) return;
         Object.defineProperty(dest, key, {
             enumerable: true,
             get: function() {
diff --git a/docs/uncompiled/artplayer-plugin-multiple-subtitles/index.js.map b/docs/uncompiled/artplayer-plugin-multiple-subtitles/index.js.map
index 811060513..169c65742 100644
--- a/docs/uncompiled/artplayer-plugin-multiple-subtitles/index.js.map
+++ b/docs/uncompiled/artplayer-plugin-multiple-subtitles/index.js.map
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{ WebVTTParser, WebVTTSerializer } from './parser';\n\nasync function loadVtt(option, { getExt, srtToVtt, assToVtt }) {\n    const response = await fetch(option.url);\n    const buffer = await response.arrayBuffer();\n    const decoder = new TextDecoder(option.encoding || 'utf-8');\n    const text = decoder.decode(buffer);\n    switch (option.type || getExt(option.url)) {\n        case 'srt': {\n            return srtToVtt(text);\n        }\n        case 'ass': {\n            return assToVtt(text);\n        }\n        case 'vtt': {\n            return text;\n        }\n        default:\n            return '';\n    }\n}\n\nfunction mergeTrees(trees) {\n    const parser = new WebVTTParser();\n    const result = parser.parse('', 'metadata');\n\n    for (let i = 0; i < trees.length; i++) {\n        const tree = trees[i];\n\n        if (!tree.updated) {\n            tree.updated = true;\n            for (let j = 0; j < tree.cues.length; j++) {\n                const cue = tree.cues[j];\n                for (let k = 0; k < cue.tree.children.length; k++) {\n                    const children = cue.tree.children[k];\n                    children.value = `<div class=\"art-subtitle-${tree.name}\">${children.value}</div>`;\n                }\n            }\n        }\n\n        if (result.cues.length === 0) {\n            result.cues = [...tree.cues];\n        } else {\n            for (let l = 0; l < result.cues.length; l++) {\n                const a = result.cues[l].tree.children;\n                const b = tree.cues[l]?.tree?.children;\n                result.cues[l] = { ...result.cues[l], tree: { children: [...a, ...b] } };\n            }\n        }\n    }\n\n    return result;\n}\n\nexport default function artplayerPluginMultipleSubtitles({ subtitles = [] }) {\n    return async (art) => {\n        const { unescape, getExt, srtToVtt, assToVtt } = art.constructor.utils;\n\n        const parser = new WebVTTParser();\n        const seri = new WebVTTSerializer();\n\n        const vtts = await Promise.all(\n            subtitles.map((option) => {\n                return loadVtt(option, { getExt, srtToVtt, assToVtt });\n            }),\n        );\n\n        const trees = vtts.map((vtt, index) => {\n            const tree = parser.parse(vtt, 'metadata');\n            tree.url = subtitles[index].url;\n            tree.name = subtitles[index].name;\n            return tree;\n        });\n\n        let lastUrl = '';\n        function setTracks(trees = []) {\n            const tree = mergeTrees(trees);\n            const vtt = seri.serialize(tree.cues);\n            URL.revokeObjectURL(lastUrl);\n            const url = URL.createObjectURL(new Blob([vtt], { type: 'text/vtt' }));\n            lastUrl = url;\n            art.option.subtitle.escape = false;\n            art.subtitle.init({\n                ...art.option.subtitle,\n                url,\n                type: 'vtt',\n                onVttLoad: unescape,\n            });\n        }\n\n        setTracks(trees);\n\n        return {\n            name: 'multipleSubtitles',\n            tracks(names = []) {\n                return setTracks(names.map((name) => trees.find((tree) => tree.name === name)));\n            },\n            reset() {\n                return setTracks(trees);\n            },\n        };\n    };\n}\n\nartplayerPluginMultipleSubtitles.env = process.env.NODE_ENV;\nartplayerPluginMultipleSubtitles.version = process.env.APP_VER;\nartplayerPluginMultipleSubtitles.build = process.env.BUILD_DATE;\n\nif (typeof window !== 'undefined') {\n    window['artplayerPluginMultipleSubtitles'] = artplayerPluginMultipleSubtitles;\n}\n","// Any copyright is dedicated to the Public Domain.\n// http://creativecommons.org/publicdomain/zero/1.0/\n\n// Not intended to be fast, but if you can make it faster, please help out!\n\n/* eslint-disable */\n(function () {\n    var defaultCueSettings = {\n        direction: 'horizontal',\n        snapToLines: true,\n        linePosition: 'auto',\n        lineAlign: 'start',\n        textPosition: 'auto',\n        positionAlign: 'auto',\n        size: 100,\n        alignment: 'center',\n    };\n\n    var WebVTTParser = function (entities) {\n        if (!entities) {\n            entities = {\n                '&amp': '&',\n                '&lt': '<',\n                '&gt': '>',\n                '&lrm': '\\u200e',\n                '&rlm': '\\u200f',\n                '&nbsp': '\\u00A0',\n            };\n        }\n        this.entities = entities;\n        this.parse = function (input, mode) {\n            // global search and replace for \\0\n            input = input.replace(/\\0/g, '\\uFFFD');\n            var NEWLINE = /\\r\\n|\\r|\\n/,\n                startTime = Date.now(),\n                linePos = 0,\n                lines = input.split(NEWLINE),\n                alreadyCollected = false,\n                styles = [],\n                cues = [],\n                errors = [];\n            function err(message, col) {\n                errors.push({ message: message, line: linePos + 1, col: col });\n            }\n\n            var line = lines[linePos],\n                lineLength = line.length,\n                signature = 'WEBVTT',\n                bom = 0,\n                signature_length = signature.length;\n\n            /* Byte order mark */\n            if (line[0] === '\\ufeff') {\n                bom = 1;\n                signature_length += 1;\n            }\n            /* SIGNATURE */\n            if (\n                lineLength < signature_length ||\n                line.indexOf(signature) !== 0 + bom ||\n                (lineLength > signature_length && line[signature_length] !== ' ' && line[signature_length] !== '\\t')\n            ) {\n                err('No valid signature. (File needs to start with \"WEBVTT\".)');\n            }\n\n            linePos++;\n\n            /* HEADER */\n            while (lines[linePos] != '' && lines[linePos] != undefined) {\n                err('No blank line after the signature.');\n                if (lines[linePos].indexOf('-->') != -1) {\n                    alreadyCollected = true;\n                    break;\n                }\n                linePos++;\n            }\n\n            /* CUE LOOP */\n            while (lines[linePos] != undefined) {\n                var cue;\n                while (!alreadyCollected && lines[linePos] == '') {\n                    linePos++;\n                }\n                if (!alreadyCollected && lines[linePos] == undefined) break;\n\n                /* CUE CREATION */\n                cue = Object.assign({}, defaultCueSettings, {\n                    id: '',\n                    startTime: 0,\n                    endTime: 0,\n                    pauseOnExit: false,\n                    direction: 'horizontal',\n                    snapToLines: true,\n                    linePosition: 'auto',\n                    lineAlign: 'start',\n                    textPosition: 'auto',\n                    positionAlign: 'auto',\n                    size: 100,\n                    alignment: 'center',\n                    text: '',\n                    tree: null,\n                });\n\n                var parseTimings = true;\n\n                if (lines[linePos].indexOf('-->') == -1) {\n                    cue.id = lines[linePos];\n\n                    /* COMMENTS\n             Not part of the specification's parser as these would just be ignored. However,\n             we want them to be conforming and not get \"Cue identifier cannot be standalone\".\n           */\n                    if (/^NOTE($|[ \\t])/.test(cue.id)) {\n                        // .startsWith fails in Chrome\n                        linePos++;\n                        while (lines[linePos] != '' && lines[linePos] != undefined) {\n                            if (lines[linePos].indexOf('-->') != -1) err('Cannot have timestamp in a comment.');\n                            linePos++;\n                        }\n                        continue;\n                    }\n\n                    /* STYLES */\n                    if (/^STYLE($|[ \\t])/.test(cue.id)) {\n                        var style = [];\n                        var invalid = false;\n                        linePos++;\n                        while (lines[linePos] != '' && lines[linePos] != undefined) {\n                            if (lines[linePos].indexOf('-->') != -1) {\n                                err('Cannot have timestamp in a style block.');\n                                invalid = true;\n                            }\n                            style.push(lines[linePos]);\n                            linePos++;\n                        }\n                        if (cues.length) {\n                            err('Style blocks cannot appear after the first cue.');\n                            continue;\n                        }\n                        if (!invalid) {\n                            styles.push(style.join('\\n'));\n                        }\n                        continue;\n                    }\n\n                    linePos++;\n\n                    if (lines[linePos] == '' || lines[linePos] == undefined) {\n                        err('Cue identifier cannot be standalone.');\n                        continue;\n                    }\n\n                    if (lines[linePos].indexOf('-->') == -1) {\n                        parseTimings = false;\n                        err('Cue identifier needs to be followed by timestamp.');\n                        continue;\n                    }\n                }\n\n                /* TIMINGS */\n                alreadyCollected = false;\n                var timings = new WebVTTCueTimingsAndSettingsParser(lines[linePos], err);\n                var previousCueStart = 0;\n                if (cues.length > 0) {\n                    previousCueStart = cues[cues.length - 1].startTime;\n                }\n                if (parseTimings && !timings.parse(cue, previousCueStart)) {\n                    /* BAD CUE */\n\n                    cue = null;\n                    linePos++;\n\n                    /* BAD CUE LOOP */\n                    while (lines[linePos] != '' && lines[linePos] != undefined) {\n                        if (lines[linePos].indexOf('-->') != -1) {\n                            alreadyCollected = true;\n                            break;\n                        }\n                        linePos++;\n                    }\n                    continue;\n                }\n                linePos++;\n\n                /* CUE TEXT LOOP */\n                while (lines[linePos] != '' && lines[linePos] != undefined) {\n                    if (lines[linePos].indexOf('-->') != -1) {\n                        err('Blank line missing before cue.');\n                        alreadyCollected = true;\n                        break;\n                    }\n                    if (cue.text != '') cue.text += '\\n';\n                    cue.text += lines[linePos];\n                    linePos++;\n                }\n\n                /* CUE TEXT PROCESSING */\n                var cuetextparser = new WebVTTCueTextParser(cue.text, err, mode, entities);\n                cue.tree = cuetextparser.parse(cue.startTime, cue.endTime);\n                cues.push(cue);\n            }\n            cues.sort(function (a, b) {\n                if (a.startTime < b.startTime) return -1;\n                if (a.startTime > b.startTime) return 1;\n                if (a.endTime > b.endTime) return -1;\n                if (a.endTime < b.endTime) return 1;\n                return 0;\n            });\n            /* END */\n            return { cues: cues, errors: errors, time: Date.now() - startTime, styles: styles };\n        };\n    };\n\n    var WebVTTCueTimingsAndSettingsParser = function (line, errorHandler) {\n        var SPACE = /[\\u0020\\t\\f]/,\n            NOSPACE = /[^\\u0020\\t\\f]/,\n            line = line,\n            pos = 0,\n            err = function (message) {\n                errorHandler(message, pos + 1);\n            },\n            spaceBeforeSetting = true;\n        function skip(pattern) {\n            while (line[pos] != undefined && pattern.test(line[pos])) {\n                pos++;\n            }\n        }\n        function collect(pattern) {\n            var str = '';\n            while (line[pos] != undefined && pattern.test(line[pos])) {\n                str += line[pos];\n                pos++;\n            }\n            return str;\n        }\n        /* http://dev.w3.org/html5/webvtt/#collect-a-webvtt-timestamp */\n        function timestamp() {\n            var units = 'minutes',\n                val1,\n                val2,\n                val3,\n                val4;\n            // 3\n            if (line[pos] == undefined) {\n                err('No timestamp found.');\n                return;\n            }\n            // 4\n            if (!/\\d/.test(line[pos])) {\n                err('Timestamp must start with a character in the range 0-9.');\n                return;\n            }\n            // 5-7\n            val1 = collect(/\\d/);\n            if (val1.length > 2 || parseInt(val1, 10) > 59) {\n                units = 'hours';\n            }\n            // 8\n            if (line[pos] != ':') {\n                err('No time unit separator found.');\n                return;\n            }\n            pos++;\n            // 9-11\n            val2 = collect(/\\d/);\n            if (val2.length != 2) {\n                err('Must be exactly two digits.');\n                return;\n            }\n            // 12\n            if (units == 'hours' || line[pos] == ':') {\n                if (line[pos] != ':') {\n                    err('No seconds found or minutes is greater than 59.');\n                    return;\n                }\n                pos++;\n                val3 = collect(/\\d/);\n                if (val3.length != 2) {\n                    err('Must be exactly two digits.');\n                    return;\n                }\n            } else {\n                if (val1.length != 2) {\n                    err('Must be exactly two digits.');\n                    return;\n                }\n                val3 = val2;\n                val2 = val1;\n                val1 = '0';\n            }\n            // 13\n            if (line[pos] != '.') {\n                err('No decimal separator (\".\") found.');\n                return;\n            }\n            pos++;\n            // 14-16\n            val4 = collect(/\\d/);\n            if (val4.length != 3) {\n                err('Milliseconds must be given in three digits.');\n                return;\n            }\n            // 17\n            if (parseInt(val2, 10) > 59) {\n                err('You cannot have more than 59 minutes.');\n                return;\n            }\n            if (parseInt(val3, 10) > 59) {\n                err('You cannot have more than 59 seconds.');\n                return;\n            }\n            return (\n                parseInt(val1, 10) * 60 * 60 + parseInt(val2, 10) * 60 + parseInt(val3, 10) + parseInt(val4, 10) / 1000\n            );\n        }\n\n        /* http://dev.w3.org/html5/webvtt/#parse-the-webvtt-settings */\n        function parseSettings(input, cue) {\n            var settings = input.split(SPACE),\n                seen = [];\n            for (var i = 0; i < settings.length; i++) {\n                if (settings[i] == '') continue;\n\n                var index = settings[i].indexOf(':'),\n                    setting = settings[i].slice(0, index),\n                    value = settings[i].slice(index + 1);\n\n                if (seen.indexOf(setting) != -1) {\n                    err('Duplicate setting.');\n                }\n                seen.push(setting);\n\n                if (value == '') {\n                    err('No value for setting defined.');\n                    return;\n                }\n\n                if (setting == 'vertical') {\n                    // writing direction\n                    if (value != 'rl' && value != 'lr') {\n                        err(\"Writing direction can only be set to 'rl' or 'rl'.\");\n                        continue;\n                    }\n                    cue.direction = value;\n                } else if (setting == 'line') {\n                    // line position and optionally line alignment\n                    if (/,/.test(value)) {\n                        var comp = value.split(',');\n                        value = comp[0];\n                        var lineAlign = comp[1];\n                    }\n                    if (!/^[-\\d](\\d*)(\\.\\d+)?%?$/.test(value)) {\n                        err('Line position takes a number or percentage.');\n                        continue;\n                    }\n                    if (value.indexOf('-', 1) != -1) {\n                        err(\"Line position can only have '-' at the start.\");\n                        continue;\n                    }\n                    if (value.indexOf('%') != -1 && value.indexOf('%') != value.length - 1) {\n                        err(\"Line position can only have '%' at the end.\");\n                        continue;\n                    }\n                    if (value[0] == '-' && value[value.length - 1] == '%') {\n                        err('Line position cannot be a negative percentage.');\n                        continue;\n                    }\n                    var numVal = value;\n                    var isPercent = false;\n                    if (value[value.length - 1] == '%') {\n                        isPercent = true;\n                        numVal = value.slice(0, value.length - 1);\n                        if (parseInt(value, 10) > 100) {\n                            err('Line position cannot be >100%.');\n                            continue;\n                        }\n                    }\n                    if (numVal === '' || isNaN(numVal) || !isFinite(numVal)) {\n                        err('Line position needs to be a number');\n                        continue;\n                    }\n                    if (lineAlign !== undefined) {\n                        if (!['start', 'center', 'end'].includes(lineAlign)) {\n                            err('Line alignment needs to be one of start, center or end');\n                            continue;\n                        }\n                        cue.lineAlign = lineAlign;\n                    }\n                    cue.snapToLines = !isPercent;\n                    cue.linePosition = parseFloat(numVal);\n                    if (parseFloat(numVal).toString() !== numVal) {\n                        cue.nonSerializable = true;\n                    }\n                } else if (setting == 'position') {\n                    // text position and optional positionAlign\n                    if (/,/.test(value)) {\n                        var comp = value.split(',');\n                        value = comp[0];\n                        var positionAlign = comp[1];\n                    }\n                    if (value[value.length - 1] != '%') {\n                        err('Text position must be a percentage.');\n                        continue;\n                    }\n                    if (parseInt(value, 10) > 100 || parseInt(value, 10) < 0) {\n                        err('Text position needs to be between 0 and 100%.');\n                        continue;\n                    }\n                    numVal = value.slice(0, value.length - 1);\n                    if (numVal === '' || isNaN(numVal) || !isFinite(numVal)) {\n                        err('Line position needs to be a number');\n                        continue;\n                    }\n                    if (positionAlign !== undefined) {\n                        if (!['line-left', 'center', 'line-right'].includes(positionAlign)) {\n                            err('Position alignment needs to be one of line-left, center or line-right');\n                            continue;\n                        }\n                        cue.positionAlign = positionAlign;\n                    }\n                    cue.textPosition = parseFloat(numVal);\n                } else if (setting == 'size') {\n                    // size\n                    if (value[value.length - 1] != '%') {\n                        err('Size must be a percentage.');\n                        continue;\n                    }\n                    if (parseInt(value, 10) > 100) {\n                        err('Size cannot be >100%.');\n                        continue;\n                    }\n                    var size = value.slice(0, value.length - 1);\n                    if (size === undefined || size === '' || isNaN(size)) {\n                        err('Size needs to be a number');\n                        size = 100;\n                        continue;\n                    } else {\n                        size = parseFloat(size);\n                        if (size < 0 || size > 100) {\n                            err('Size needs to be between 0 and 100%.');\n                            continue;\n                        }\n                    }\n                    cue.size = size;\n                } else if (setting == 'align') {\n                    // alignment\n                    var alignValues = ['start', 'center', 'end', 'left', 'right'];\n                    if (alignValues.indexOf(value) == -1) {\n                        err('Alignment can only be set to one of ' + alignValues.join(', ') + '.');\n                        continue;\n                    }\n                    cue.alignment = value;\n                } else {\n                    err('Invalid setting.');\n                }\n            }\n        }\n\n        this.parse = function (cue, previousCueStart) {\n            skip(SPACE);\n            cue.startTime = timestamp();\n            if (cue.startTime == undefined) {\n                return;\n            }\n            if (cue.startTime < previousCueStart) {\n                err('Start timestamp is not greater than or equal to start timestamp of previous cue.');\n            }\n            if (NOSPACE.test(line[pos])) {\n                err(\"Timestamp not separated from '-->' by whitespace.\");\n            }\n            skip(SPACE);\n            // 6-8\n            if (line[pos] != '-') {\n                err('No valid timestamp separator found.');\n                return;\n            }\n            pos++;\n            if (line[pos] != '-') {\n                err('No valid timestamp separator found.');\n                return;\n            }\n            pos++;\n            if (line[pos] != '>') {\n                err('No valid timestamp separator found.');\n                return;\n            }\n            pos++;\n            if (NOSPACE.test(line[pos])) {\n                err(\"'-->' not separated from timestamp by whitespace.\");\n            }\n            skip(SPACE);\n            cue.endTime = timestamp();\n            if (cue.endTime == undefined) {\n                return;\n            }\n            if (cue.endTime <= cue.startTime) {\n                err('End timestamp is not greater than start timestamp.');\n            }\n\n            if (NOSPACE.test(line[pos])) {\n                spaceBeforeSetting = false;\n            }\n            skip(SPACE);\n            parseSettings(line.substring(pos), cue);\n            return true;\n        };\n        this.parseTimestamp = function () {\n            var ts = timestamp();\n            if (line[pos] != undefined) {\n                err('Timestamp must not have trailing characters.');\n                return;\n            }\n            return ts;\n        };\n    };\n\n    var WebVTTCueTextParser = function (line, errorHandler, mode, entities) {\n        this.entities = entities;\n        var self = this;\n        var line = line,\n            pos = 0,\n            err = function (message) {\n                if (mode == 'metadata') return;\n                errorHandler(message, pos + 1);\n            };\n\n        this.parse = function (cueStart, cueEnd) {\n            function removeCycles(tree) {\n                const cyclelessTree = { ...tree };\n                if (tree.children) {\n                    cyclelessTree.children = tree.children.map(removeCycles);\n                }\n                if (cyclelessTree.parent) {\n                    delete cyclelessTree.parent;\n                }\n                return cyclelessTree;\n            }\n\n            var result = { children: [] },\n                current = result,\n                timestamps = [];\n\n            function attach(token) {\n                current.children.push({\n                    type: 'object',\n                    name: token[1],\n                    classes: token[2],\n                    children: [],\n                    parent: current,\n                });\n                current = current.children[current.children.length - 1];\n            }\n            function inScope(name) {\n                var node = current;\n                while (node) {\n                    if (node.name == name) return true;\n                    node = node.parent;\n                }\n                return;\n            }\n\n            while (line[pos] != undefined) {\n                var token = nextToken();\n                if (token[0] == 'text') {\n                    current.children.push({ type: 'text', value: token[1], parent: current });\n                } else if (token[0] == 'start tag') {\n                    if (mode == 'chapters') err('Start tags not allowed in chapter title text.');\n                    var name = token[1];\n                    if (name != 'v' && name != 'lang' && token[3] != '') {\n                        err('Only <v> and <lang> can have an annotation.');\n                    }\n                    if (name == 'c' || name == 'i' || name == 'b' || name == 'u' || name == 'ruby') {\n                        attach(token);\n                    } else if (name == 'rt' && current.name == 'ruby') {\n                        attach(token);\n                    } else if (name == 'v') {\n                        if (inScope('v')) {\n                            err('<v> cannot be nested inside itself.');\n                        }\n                        attach(token);\n                        current.value = token[3]; // annotation\n                        if (!token[3]) {\n                            err('<v> requires an annotation.');\n                        }\n                    } else if (name == 'lang') {\n                        attach(token);\n                        current.value = token[3]; // language\n                    } else {\n                        err('Incorrect start tag.');\n                    }\n                } else if (token[0] == 'end tag') {\n                    if (mode == 'chapters') err('End tags not allowed in chapter title text.');\n                    // XXX check <ruby> content\n                    if (token[1] == current.name) {\n                        current = current.parent;\n                    } else if (token[1] == 'ruby' && current.name == 'rt') {\n                        current = current.parent.parent;\n                    } else {\n                        err('Incorrect end tag.');\n                    }\n                } else if (token[0] == 'timestamp') {\n                    if (mode == 'chapters') err('Timestamp not allowed in chapter title text.');\n                    var timings = new WebVTTCueTimingsAndSettingsParser(token[1], err),\n                        timestamp = timings.parseTimestamp();\n                    if (timestamp != undefined) {\n                        if (timestamp <= cueStart || timestamp >= cueEnd) {\n                            err('Timestamp must be between start timestamp and end timestamp.');\n                        }\n                        if (timestamps.length > 0 && timestamps[timestamps.length - 1] >= timestamp) {\n                            err('Timestamp must be greater than any previous timestamp.');\n                        }\n                        current.children.push({ type: 'timestamp', value: timestamp, parent: current });\n                        timestamps.push(timestamp);\n                    }\n                }\n            }\n            while (current.parent) {\n                if (current.name != 'v') {\n                    err('Required end tag missing.');\n                }\n                current = current.parent;\n            }\n            return removeCycles(result);\n        };\n\n        function nextToken() {\n            var state = 'data',\n                result = '',\n                buffer = '',\n                classes = [];\n            while (line[pos - 1] != undefined || pos == 0) {\n                var c = line[pos];\n                if (state == 'data') {\n                    if (c == '&') {\n                        buffer = c;\n                        state = 'escape';\n                    } else if (c == '<' && result == '') {\n                        state = 'tag';\n                    } else if (c == '<' || c == undefined) {\n                        return ['text', result];\n                    } else {\n                        result += c;\n                    }\n                } else if (state == 'escape') {\n                    if (c == '<' || c == undefined) {\n                        err('Incorrect escape.');\n                        let m;\n                        if ((m = buffer.match(/^&#([0-9]+)$/))) {\n                            result += String.fromCharCode(m[1]);\n                        } else {\n                            if (self.entities[buffer]) {\n                                result += self.entities[buffer];\n                            } else {\n                                result += buffer;\n                            }\n                        }\n                        return ['text', result];\n                    } else if (c == '&') {\n                        err('Incorrect escape.');\n                        result += buffer;\n                        buffer = c;\n                    } else if (/[a-z#0-9]/i.test(c)) {\n                        buffer += c;\n                    } else if (c == ';') {\n                        let m;\n                        if ((m = buffer.match(/^&#(x?[0-9]+)$/))) {\n                            // we prepend \"0\" so that x20 be interpreted as hexadecim (0x20)\n                            result += String.fromCharCode('0' + m[1]);\n                        } else if (self.entities[buffer + c]) {\n                            result += self.entities[buffer + c];\n                        } else if ((m = Object.keys(entities).find((n) => buffer.startsWith(n)))) {\n                            // partial match\n                            result += self.entities[m] + buffer.slice(m.length) + c;\n                        } else {\n                            err('Incorrect escape.');\n                            result += buffer + ';';\n                        }\n                        state = 'data';\n                    } else {\n                        err('Incorrect escape.');\n                        result += buffer + c;\n                        state = 'data';\n                    }\n                } else if (state == 'tag') {\n                    if (c == '\\t' || c == '\\n' || c == '\\f' || c == ' ') {\n                        state = 'start tag annotation';\n                    } else if (c == '.') {\n                        state = 'start tag class';\n                    } else if (c == '/') {\n                        state = 'end tag';\n                    } else if (/\\d/.test(c)) {\n                        result = c;\n                        state = 'timestamp tag';\n                    } else if (c == '>' || c == undefined) {\n                        if (c == '>') {\n                            pos++;\n                        }\n                        return ['start tag', '', [], ''];\n                    } else {\n                        result = c;\n                        state = 'start tag';\n                    }\n                } else if (state == 'start tag') {\n                    if (c == '\\t' || c == '\\f' || c == ' ') {\n                        state = 'start tag annotation';\n                    } else if (c == '\\n') {\n                        buffer = c;\n                        state = 'start tag annotation';\n                    } else if (c == '.') {\n                        state = 'start tag class';\n                    } else if (c == '>' || c == undefined) {\n                        if (c == '>') {\n                            pos++;\n                        }\n                        return ['start tag', result, [], ''];\n                    } else {\n                        result += c;\n                    }\n                } else if (state == 'start tag class') {\n                    if (c == '\\t' || c == '\\f' || c == ' ') {\n                        if (buffer) {\n                            classes.push(buffer);\n                        }\n                        buffer = '';\n                        state = 'start tag annotation';\n                    } else if (c == '\\n') {\n                        if (buffer) {\n                            classes.push(buffer);\n                        }\n                        buffer = c;\n                        state = 'start tag annotation';\n                    } else if (c == '.') {\n                        if (buffer) {\n                            classes.push(buffer);\n                        }\n                        buffer = '';\n                    } else if (c == '>' || c == undefined) {\n                        if (c == '>') {\n                            pos++;\n                        }\n                        if (buffer) {\n                            classes.push(buffer);\n                        }\n                        return ['start tag', result, classes, ''];\n                    } else {\n                        buffer += c;\n                    }\n                } else if (state == 'start tag annotation') {\n                    if (c == '>' || c == undefined) {\n                        if (c == '>') {\n                            pos++;\n                        }\n                        buffer = buffer\n                            .split(/[\\u0020\\t\\f\\r\\n]+/)\n                            .filter(function (item) {\n                                if (item) return true;\n                            })\n                            .join(' ');\n                        return ['start tag', result, classes, buffer];\n                    } else {\n                        buffer += c;\n                    }\n                } else if (state == 'end tag') {\n                    if (c == '>' || c == undefined) {\n                        if (c == '>') {\n                            pos++;\n                        }\n                        return ['end tag', result];\n                    } else {\n                        result += c;\n                    }\n                } else if (state == 'timestamp tag') {\n                    if (c == '>' || c == undefined) {\n                        if (c == '>') {\n                            pos++;\n                        }\n                        return ['timestamp', result];\n                    } else {\n                        result += c;\n                    }\n                } else {\n                    err('Never happens.'); // The joke is it might.\n                }\n                // 8\n                pos++;\n            }\n        }\n    };\n\n    var WebVTTSerializer = function () {\n        function serializeTimestamp(seconds) {\n            const ms = ('00' + (seconds - Math.floor(seconds)).toFixed(3) * 1000).slice(-3);\n            let h = 0,\n                m = 0,\n                s = 0;\n            if (seconds >= 3600) {\n                h = Math.floor(seconds / 3600);\n            }\n            m = Math.floor((seconds - 3600 * h) / 60);\n            s = Math.floor(seconds - 3600 * h - 60 * m);\n            return (h ? h + ':' : '') + ('' + m).padStart(2, '0') + ':' + ('' + s).padStart(2, '0') + '.' + ms;\n        }\n        function serializeCueSettings(cue) {\n            var result = '';\n            const nonDefaultSettings = Object.keys(defaultCueSettings).filter((s) => cue[s] !== defaultCueSettings[s]);\n            if (nonDefaultSettings.includes('direction')) {\n                result += ' vertical:' + cue.direction;\n            }\n            if (nonDefaultSettings.includes('alignment')) {\n                result += ' align:' + cue.alignment;\n            }\n            if (nonDefaultSettings.includes('size')) {\n                result += ' size:' + cue.size + '%';\n            }\n            if (nonDefaultSettings.includes('lineAlign') || nonDefaultSettings.includes('linePosition')) {\n                result +=\n                    ' line:' +\n                    cue.linePosition +\n                    (cue.snapToLines ? '' : '%') +\n                    (cue.lineAlign && cue.lineAlign != defaultCueSettings.lineAlign ? ',' + cue.lineAlign : '');\n            }\n            if (nonDefaultSettings.includes('textPosition') || nonDefaultSettings.includes('positionAlign')) {\n                result +=\n                    ' position:' +\n                    cue.textPosition +\n                    '%' +\n                    (cue.positionAlign && cue.positionAlign !== defaultCueSettings.positionAlign\n                        ? ',' + cue.positionAlign\n                        : '');\n            }\n            return result;\n        }\n        function serializeTree(tree) {\n            var result = '';\n            for (var i = 0; i < tree.length; i++) {\n                var node = tree[i];\n                if (node.type == 'text') {\n                    result += node.value.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');\n                } else if (node.type == 'object') {\n                    result += '<' + node.name;\n                    if (node.classes) {\n                        for (var y = 0; y < node.classes.length; y++) {\n                            result += '.' + node.classes[y];\n                        }\n                    }\n                    if (node.value) {\n                        result += ' ' + node.value;\n                    }\n                    result += '>';\n                    if (node.children) result += serializeTree(node.children);\n                    result += '</' + node.name + '>';\n                } else if (node.type == 'timestamp') {\n                    result += '<' + serializeTimestamp(node.value) + '>';\n                } else {\n                    result += '<' + node.value + '>';\n                }\n            }\n            return result;\n        }\n        function serializeCue(cue) {\n            return (\n                (cue.id !== undefined ? cue.id + '\\n' : '') +\n                serializeTimestamp(cue.startTime) +\n                ' --> ' +\n                serializeTimestamp(cue.endTime) +\n                serializeCueSettings(cue) +\n                '\\n' +\n                serializeTree(cue.tree.children) +\n                '\\n\\n'\n            );\n        }\n        function serializeStyle(style) {\n            return 'STYLE\\n' + style + '\\n\\n';\n        }\n        this.serialize = function (cues, styles) {\n            var result = 'WEBVTT\\n\\n';\n            if (styles) {\n                for (var i = 0; i < styles.length; i++) {\n                    result += serializeStyle(styles[i]);\n                }\n            }\n            for (var i = 0; i < cues.length; i++) {\n                result += serializeCue(cues[i]);\n            }\n            return result;\n        };\n    };\n\n    function exportify(object) {\n        object.WebVTTParser = WebVTTParser;\n        object.WebVTTCueTimingsAndSettingsParser = WebVTTCueTimingsAndSettingsParser;\n        object.WebVTTCueTextParser = WebVTTCueTextParser;\n        object.WebVTTSerializer = WebVTTSerializer;\n    }\n    if (typeof window !== 'undefined') exportify(window);\n    if (typeof exports !== 'undefined') exportify(exports);\n})();\n","exports.interopDefault = function (a) {\n  return a && a.__esModule ? a : {default: a};\n};\n\nexports.defineInteropFlag = function (a) {\n  Object.defineProperty(a, '__esModule', {value: true});\n};\n\nexports.exportAll = function (source, dest) {\n  Object.keys(source).forEach(function (key) {\n    if (key === 'default' || key === '__esModule' || dest.hasOwnProperty(key)) {\n      return;\n    }\n\n    Object.defineProperty(dest, key, {\n      enumerable: true,\n      get: function () {\n        return source[key];\n      },\n    });\n  });\n\n  return dest;\n};\n\nexports.export = function (dest, destName, get) {\n  Object.defineProperty(dest, destName, {\n    enumerable: true,\n    get: get,\n  });\n};\n"],"names":[],"version":3,"file":"index.js.map","sourceRoot":"../../../"}
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{ WebVTTParser, WebVTTSerializer } from './parser';\n\nasync function loadVtt(option, { getExt, srtToVtt, assToVtt }) {\n    const response = await fetch(option.url);\n    const buffer = await response.arrayBuffer();\n    const decoder = new TextDecoder(option.encoding || 'utf-8');\n    const text = decoder.decode(buffer);\n    switch (option.type || getExt(option.url)) {\n        case 'srt': {\n            return srtToVtt(text);\n        }\n        case 'ass': {\n            return assToVtt(text);\n        }\n        case 'vtt': {\n            return text;\n        }\n        default:\n            return '';\n    }\n}\n\nfunction mergeTrees(trees) {\n    const parser = new WebVTTParser();\n    const result = parser.parse('', 'metadata');\n\n    for (let i = 0; i < trees.length; i++) {\n        const tree = trees[i];\n\n        if (!tree.updated) {\n            tree.updated = true;\n            for (let j = 0; j < tree.cues.length; j++) {\n                const cue = tree.cues[j];\n                for (let k = 0; k < cue.tree.children.length; k++) {\n                    const children = cue.tree.children[k];\n                    children.value = `<div class=\"art-subtitle-${tree.name}\">${children.value}</div>`;\n                }\n            }\n        }\n\n        result.cues.push(...tree.cues);\n    }\n\n    return result;\n}\n\nexport default function artplayerPluginMultipleSubtitles({ subtitles = [] }) {\n    return async (art) => {\n        const { unescape, getExt, srtToVtt, assToVtt } = art.constructor.utils;\n\n        const parser = new WebVTTParser();\n        const seri = new WebVTTSerializer();\n\n        const vtts = await Promise.all(\n            subtitles.map((option) => {\n                return loadVtt(option, { getExt, srtToVtt, assToVtt });\n            }),\n        );\n\n        const trees = vtts.map((vtt, index) => {\n            const tree = parser.parse(vtt, 'metadata');\n            tree.url = subtitles[index].url;\n            tree.name = subtitles[index].name;\n            return tree;\n        });\n\n        let lastUrl = '';\n        function setTracks(trees = []) {\n            const tree = mergeTrees(trees);\n            const vtt = seri.serialize(tree.cues);\n            URL.revokeObjectURL(lastUrl);\n            const url = URL.createObjectURL(new Blob([vtt], { type: 'text/vtt' }));\n            lastUrl = url;\n            art.option.subtitle.escape = false;\n            art.subtitle.init({\n                ...art.option.subtitle,\n                url,\n                type: 'vtt',\n                onVttLoad: unescape,\n            });\n        }\n\n        setTracks(trees);\n\n        return {\n            name: 'multipleSubtitles',\n            tracks(names = []) {\n                return setTracks(names.map((name) => trees.find((tree) => tree.name === name)));\n            },\n            reset() {\n                return setTracks(trees);\n            },\n        };\n    };\n}\n\nif (typeof window !== 'undefined') {\n    window['artplayerPluginMultipleSubtitles'] = artplayerPluginMultipleSubtitles;\n}\n","// Any copyright is dedicated to the Public Domain.\n// http://creativecommons.org/publicdomain/zero/1.0/\n\n// Not intended to be fast, but if you can make it faster, please help out!\n\n/* eslint-disable */\n(function () {\n    var defaultCueSettings = {\n        direction: 'horizontal',\n        snapToLines: true,\n        linePosition: 'auto',\n        lineAlign: 'start',\n        textPosition: 'auto',\n        positionAlign: 'auto',\n        size: 100,\n        alignment: 'center',\n    };\n\n    var WebVTTParser = function (entities) {\n        if (!entities) {\n            entities = {\n                '&amp': '&',\n                '&lt': '<',\n                '&gt': '>',\n                '&lrm': '\\u200e',\n                '&rlm': '\\u200f',\n                '&nbsp': '\\u00A0',\n            };\n        }\n        this.entities = entities;\n        this.parse = function (input, mode) {\n            // global search and replace for \\0\n            input = input.replace(/\\0/g, '\\uFFFD');\n            var NEWLINE = /\\r\\n|\\r|\\n/,\n                startTime = Date.now(),\n                linePos = 0,\n                lines = input.split(NEWLINE),\n                alreadyCollected = false,\n                styles = [],\n                cues = [],\n                errors = [];\n            function err(message, col) {\n                errors.push({ message: message, line: linePos + 1, col: col });\n            }\n\n            var line = lines[linePos],\n                lineLength = line.length,\n                signature = 'WEBVTT',\n                bom = 0,\n                signature_length = signature.length;\n\n            /* Byte order mark */\n            if (line[0] === '\\ufeff') {\n                bom = 1;\n                signature_length += 1;\n            }\n            /* SIGNATURE */\n            if (\n                lineLength < signature_length ||\n                line.indexOf(signature) !== 0 + bom ||\n                (lineLength > signature_length && line[signature_length] !== ' ' && line[signature_length] !== '\\t')\n            ) {\n                err('No valid signature. (File needs to start with \"WEBVTT\".)');\n            }\n\n            linePos++;\n\n            /* HEADER */\n            while (lines[linePos] != '' && lines[linePos] != undefined) {\n                err('No blank line after the signature.');\n                if (lines[linePos].indexOf('-->') != -1) {\n                    alreadyCollected = true;\n                    break;\n                }\n                linePos++;\n            }\n\n            /* CUE LOOP */\n            while (lines[linePos] != undefined) {\n                var cue;\n                while (!alreadyCollected && lines[linePos] == '') {\n                    linePos++;\n                }\n                if (!alreadyCollected && lines[linePos] == undefined) break;\n\n                /* CUE CREATION */\n                cue = Object.assign({}, defaultCueSettings, {\n                    id: '',\n                    startTime: 0,\n                    endTime: 0,\n                    pauseOnExit: false,\n                    direction: 'horizontal',\n                    snapToLines: true,\n                    linePosition: 'auto',\n                    lineAlign: 'start',\n                    textPosition: 'auto',\n                    positionAlign: 'auto',\n                    size: 100,\n                    alignment: 'center',\n                    text: '',\n                    tree: null,\n                });\n\n                var parseTimings = true;\n\n                if (lines[linePos].indexOf('-->') == -1) {\n                    cue.id = lines[linePos];\n\n                    /* COMMENTS\n             Not part of the specification's parser as these would just be ignored. However,\n             we want them to be conforming and not get \"Cue identifier cannot be standalone\".\n           */\n                    if (/^NOTE($|[ \\t])/.test(cue.id)) {\n                        // .startsWith fails in Chrome\n                        linePos++;\n                        while (lines[linePos] != '' && lines[linePos] != undefined) {\n                            if (lines[linePos].indexOf('-->') != -1) err('Cannot have timestamp in a comment.');\n                            linePos++;\n                        }\n                        continue;\n                    }\n\n                    /* STYLES */\n                    if (/^STYLE($|[ \\t])/.test(cue.id)) {\n                        var style = [];\n                        var invalid = false;\n                        linePos++;\n                        while (lines[linePos] != '' && lines[linePos] != undefined) {\n                            if (lines[linePos].indexOf('-->') != -1) {\n                                err('Cannot have timestamp in a style block.');\n                                invalid = true;\n                            }\n                            style.push(lines[linePos]);\n                            linePos++;\n                        }\n                        if (cues.length) {\n                            err('Style blocks cannot appear after the first cue.');\n                            continue;\n                        }\n                        if (!invalid) {\n                            styles.push(style.join('\\n'));\n                        }\n                        continue;\n                    }\n\n                    linePos++;\n\n                    if (lines[linePos] == '' || lines[linePos] == undefined) {\n                        err('Cue identifier cannot be standalone.');\n                        continue;\n                    }\n\n                    if (lines[linePos].indexOf('-->') == -1) {\n                        parseTimings = false;\n                        err('Cue identifier needs to be followed by timestamp.');\n                        continue;\n                    }\n                }\n\n                /* TIMINGS */\n                alreadyCollected = false;\n                var timings = new WebVTTCueTimingsAndSettingsParser(lines[linePos], err);\n                var previousCueStart = 0;\n                if (cues.length > 0) {\n                    previousCueStart = cues[cues.length - 1].startTime;\n                }\n                if (parseTimings && !timings.parse(cue, previousCueStart)) {\n                    /* BAD CUE */\n\n                    cue = null;\n                    linePos++;\n\n                    /* BAD CUE LOOP */\n                    while (lines[linePos] != '' && lines[linePos] != undefined) {\n                        if (lines[linePos].indexOf('-->') != -1) {\n                            alreadyCollected = true;\n                            break;\n                        }\n                        linePos++;\n                    }\n                    continue;\n                }\n                linePos++;\n\n                /* CUE TEXT LOOP */\n                while (lines[linePos] != '' && lines[linePos] != undefined) {\n                    if (lines[linePos].indexOf('-->') != -1) {\n                        err('Blank line missing before cue.');\n                        alreadyCollected = true;\n                        break;\n                    }\n                    if (cue.text != '') cue.text += '\\n';\n                    cue.text += lines[linePos];\n                    linePos++;\n                }\n\n                /* CUE TEXT PROCESSING */\n                var cuetextparser = new WebVTTCueTextParser(cue.text, err, mode, entities);\n                cue.tree = cuetextparser.parse(cue.startTime, cue.endTime);\n                cues.push(cue);\n            }\n            cues.sort(function (a, b) {\n                if (a.startTime < b.startTime) return -1;\n                if (a.startTime > b.startTime) return 1;\n                if (a.endTime > b.endTime) return -1;\n                if (a.endTime < b.endTime) return 1;\n                return 0;\n            });\n            /* END */\n            return { cues: cues, errors: errors, time: Date.now() - startTime, styles: styles };\n        };\n    };\n\n    var WebVTTCueTimingsAndSettingsParser = function (line, errorHandler) {\n        var SPACE = /[\\u0020\\t\\f]/,\n            NOSPACE = /[^\\u0020\\t\\f]/,\n            line = line,\n            pos = 0,\n            err = function (message) {\n                errorHandler(message, pos + 1);\n            },\n            spaceBeforeSetting = true;\n        function skip(pattern) {\n            while (line[pos] != undefined && pattern.test(line[pos])) {\n                pos++;\n            }\n        }\n        function collect(pattern) {\n            var str = '';\n            while (line[pos] != undefined && pattern.test(line[pos])) {\n                str += line[pos];\n                pos++;\n            }\n            return str;\n        }\n        /* http://dev.w3.org/html5/webvtt/#collect-a-webvtt-timestamp */\n        function timestamp() {\n            var units = 'minutes',\n                val1,\n                val2,\n                val3,\n                val4;\n            // 3\n            if (line[pos] == undefined) {\n                err('No timestamp found.');\n                return;\n            }\n            // 4\n            if (!/\\d/.test(line[pos])) {\n                err('Timestamp must start with a character in the range 0-9.');\n                return;\n            }\n            // 5-7\n            val1 = collect(/\\d/);\n            if (val1.length > 2 || parseInt(val1, 10) > 59) {\n                units = 'hours';\n            }\n            // 8\n            if (line[pos] != ':') {\n                err('No time unit separator found.');\n                return;\n            }\n            pos++;\n            // 9-11\n            val2 = collect(/\\d/);\n            if (val2.length != 2) {\n                err('Must be exactly two digits.');\n                return;\n            }\n            // 12\n            if (units == 'hours' || line[pos] == ':') {\n                if (line[pos] != ':') {\n                    err('No seconds found or minutes is greater than 59.');\n                    return;\n                }\n                pos++;\n                val3 = collect(/\\d/);\n                if (val3.length != 2) {\n                    err('Must be exactly two digits.');\n                    return;\n                }\n            } else {\n                if (val1.length != 2) {\n                    err('Must be exactly two digits.');\n                    return;\n                }\n                val3 = val2;\n                val2 = val1;\n                val1 = '0';\n            }\n            // 13\n            if (line[pos] != '.') {\n                err('No decimal separator (\".\") found.');\n                return;\n            }\n            pos++;\n            // 14-16\n            val4 = collect(/\\d/);\n            if (val4.length != 3) {\n                err('Milliseconds must be given in three digits.');\n                return;\n            }\n            // 17\n            if (parseInt(val2, 10) > 59) {\n                err('You cannot have more than 59 minutes.');\n                return;\n            }\n            if (parseInt(val3, 10) > 59) {\n                err('You cannot have more than 59 seconds.');\n                return;\n            }\n            return (\n                parseInt(val1, 10) * 60 * 60 + parseInt(val2, 10) * 60 + parseInt(val3, 10) + parseInt(val4, 10) / 1000\n            );\n        }\n\n        /* http://dev.w3.org/html5/webvtt/#parse-the-webvtt-settings */\n        function parseSettings(input, cue) {\n            var settings = input.split(SPACE),\n                seen = [];\n            for (var i = 0; i < settings.length; i++) {\n                if (settings[i] == '') continue;\n\n                var index = settings[i].indexOf(':'),\n                    setting = settings[i].slice(0, index),\n                    value = settings[i].slice(index + 1);\n\n                if (seen.indexOf(setting) != -1) {\n                    err('Duplicate setting.');\n                }\n                seen.push(setting);\n\n                if (value == '') {\n                    err('No value for setting defined.');\n                    return;\n                }\n\n                if (setting == 'vertical') {\n                    // writing direction\n                    if (value != 'rl' && value != 'lr') {\n                        err(\"Writing direction can only be set to 'rl' or 'rl'.\");\n                        continue;\n                    }\n                    cue.direction = value;\n                } else if (setting == 'line') {\n                    // line position and optionally line alignment\n                    if (/,/.test(value)) {\n                        var comp = value.split(',');\n                        value = comp[0];\n                        var lineAlign = comp[1];\n                    }\n                    if (!/^[-\\d](\\d*)(\\.\\d+)?%?$/.test(value)) {\n                        err('Line position takes a number or percentage.');\n                        continue;\n                    }\n                    if (value.indexOf('-', 1) != -1) {\n                        err(\"Line position can only have '-' at the start.\");\n                        continue;\n                    }\n                    if (value.indexOf('%') != -1 && value.indexOf('%') != value.length - 1) {\n                        err(\"Line position can only have '%' at the end.\");\n                        continue;\n                    }\n                    if (value[0] == '-' && value[value.length - 1] == '%') {\n                        err('Line position cannot be a negative percentage.');\n                        continue;\n                    }\n                    var numVal = value;\n                    var isPercent = false;\n                    if (value[value.length - 1] == '%') {\n                        isPercent = true;\n                        numVal = value.slice(0, value.length - 1);\n                        if (parseInt(value, 10) > 100) {\n                            err('Line position cannot be >100%.');\n                            continue;\n                        }\n                    }\n                    if (numVal === '' || isNaN(numVal) || !isFinite(numVal)) {\n                        err('Line position needs to be a number');\n                        continue;\n                    }\n                    if (lineAlign !== undefined) {\n                        if (!['start', 'center', 'end'].includes(lineAlign)) {\n                            err('Line alignment needs to be one of start, center or end');\n                            continue;\n                        }\n                        cue.lineAlign = lineAlign;\n                    }\n                    cue.snapToLines = !isPercent;\n                    cue.linePosition = parseFloat(numVal);\n                    if (parseFloat(numVal).toString() !== numVal) {\n                        cue.nonSerializable = true;\n                    }\n                } else if (setting == 'position') {\n                    // text position and optional positionAlign\n                    if (/,/.test(value)) {\n                        var comp = value.split(',');\n                        value = comp[0];\n                        var positionAlign = comp[1];\n                    }\n                    if (value[value.length - 1] != '%') {\n                        err('Text position must be a percentage.');\n                        continue;\n                    }\n                    if (parseInt(value, 10) > 100 || parseInt(value, 10) < 0) {\n                        err('Text position needs to be between 0 and 100%.');\n                        continue;\n                    }\n                    numVal = value.slice(0, value.length - 1);\n                    if (numVal === '' || isNaN(numVal) || !isFinite(numVal)) {\n                        err('Line position needs to be a number');\n                        continue;\n                    }\n                    if (positionAlign !== undefined) {\n                        if (!['line-left', 'center', 'line-right'].includes(positionAlign)) {\n                            err('Position alignment needs to be one of line-left, center or line-right');\n                            continue;\n                        }\n                        cue.positionAlign = positionAlign;\n                    }\n                    cue.textPosition = parseFloat(numVal);\n                } else if (setting == 'size') {\n                    // size\n                    if (value[value.length - 1] != '%') {\n                        err('Size must be a percentage.');\n                        continue;\n                    }\n                    if (parseInt(value, 10) > 100) {\n                        err('Size cannot be >100%.');\n                        continue;\n                    }\n                    var size = value.slice(0, value.length - 1);\n                    if (size === undefined || size === '' || isNaN(size)) {\n                        err('Size needs to be a number');\n                        size = 100;\n                        continue;\n                    } else {\n                        size = parseFloat(size);\n                        if (size < 0 || size > 100) {\n                            err('Size needs to be between 0 and 100%.');\n                            continue;\n                        }\n                    }\n                    cue.size = size;\n                } else if (setting == 'align') {\n                    // alignment\n                    var alignValues = ['start', 'center', 'end', 'left', 'right'];\n                    if (alignValues.indexOf(value) == -1) {\n                        err('Alignment can only be set to one of ' + alignValues.join(', ') + '.');\n                        continue;\n                    }\n                    cue.alignment = value;\n                } else {\n                    err('Invalid setting.');\n                }\n            }\n        }\n\n        this.parse = function (cue, previousCueStart) {\n            skip(SPACE);\n            cue.startTime = timestamp();\n            if (cue.startTime == undefined) {\n                return;\n            }\n            if (cue.startTime < previousCueStart) {\n                err('Start timestamp is not greater than or equal to start timestamp of previous cue.');\n            }\n            if (NOSPACE.test(line[pos])) {\n                err(\"Timestamp not separated from '-->' by whitespace.\");\n            }\n            skip(SPACE);\n            // 6-8\n            if (line[pos] != '-') {\n                err('No valid timestamp separator found.');\n                return;\n            }\n            pos++;\n            if (line[pos] != '-') {\n                err('No valid timestamp separator found.');\n                return;\n            }\n            pos++;\n            if (line[pos] != '>') {\n                err('No valid timestamp separator found.');\n                return;\n            }\n            pos++;\n            if (NOSPACE.test(line[pos])) {\n                err(\"'-->' not separated from timestamp by whitespace.\");\n            }\n            skip(SPACE);\n            cue.endTime = timestamp();\n            if (cue.endTime == undefined) {\n                return;\n            }\n            if (cue.endTime <= cue.startTime) {\n                err('End timestamp is not greater than start timestamp.');\n            }\n\n            if (NOSPACE.test(line[pos])) {\n                spaceBeforeSetting = false;\n            }\n            skip(SPACE);\n            parseSettings(line.substring(pos), cue);\n            return true;\n        };\n        this.parseTimestamp = function () {\n            var ts = timestamp();\n            if (line[pos] != undefined) {\n                err('Timestamp must not have trailing characters.');\n                return;\n            }\n            return ts;\n        };\n    };\n\n    var WebVTTCueTextParser = function (line, errorHandler, mode, entities) {\n        this.entities = entities;\n        var self = this;\n        var line = line,\n            pos = 0,\n            err = function (message) {\n                if (mode == 'metadata') return;\n                errorHandler(message, pos + 1);\n            };\n\n        this.parse = function (cueStart, cueEnd) {\n            function removeCycles(tree) {\n                const cyclelessTree = { ...tree };\n                if (tree.children) {\n                    cyclelessTree.children = tree.children.map(removeCycles);\n                }\n                if (cyclelessTree.parent) {\n                    delete cyclelessTree.parent;\n                }\n                return cyclelessTree;\n            }\n\n            var result = { children: [] },\n                current = result,\n                timestamps = [];\n\n            function attach(token) {\n                current.children.push({\n                    type: 'object',\n                    name: token[1],\n                    classes: token[2],\n                    children: [],\n                    parent: current,\n                });\n                current = current.children[current.children.length - 1];\n            }\n            function inScope(name) {\n                var node = current;\n                while (node) {\n                    if (node.name == name) return true;\n                    node = node.parent;\n                }\n                return;\n            }\n\n            while (line[pos] != undefined) {\n                var token = nextToken();\n                if (token[0] == 'text') {\n                    current.children.push({ type: 'text', value: token[1], parent: current });\n                } else if (token[0] == 'start tag') {\n                    if (mode == 'chapters') err('Start tags not allowed in chapter title text.');\n                    var name = token[1];\n                    if (name != 'v' && name != 'lang' && token[3] != '') {\n                        err('Only <v> and <lang> can have an annotation.');\n                    }\n                    if (name == 'c' || name == 'i' || name == 'b' || name == 'u' || name == 'ruby') {\n                        attach(token);\n                    } else if (name == 'rt' && current.name == 'ruby') {\n                        attach(token);\n                    } else if (name == 'v') {\n                        if (inScope('v')) {\n                            err('<v> cannot be nested inside itself.');\n                        }\n                        attach(token);\n                        current.value = token[3]; // annotation\n                        if (!token[3]) {\n                            err('<v> requires an annotation.');\n                        }\n                    } else if (name == 'lang') {\n                        attach(token);\n                        current.value = token[3]; // language\n                    } else {\n                        err('Incorrect start tag.');\n                    }\n                } else if (token[0] == 'end tag') {\n                    if (mode == 'chapters') err('End tags not allowed in chapter title text.');\n                    // XXX check <ruby> content\n                    if (token[1] == current.name) {\n                        current = current.parent;\n                    } else if (token[1] == 'ruby' && current.name == 'rt') {\n                        current = current.parent.parent;\n                    } else {\n                        err('Incorrect end tag.');\n                    }\n                } else if (token[0] == 'timestamp') {\n                    if (mode == 'chapters') err('Timestamp not allowed in chapter title text.');\n                    var timings = new WebVTTCueTimingsAndSettingsParser(token[1], err),\n                        timestamp = timings.parseTimestamp();\n                    if (timestamp != undefined) {\n                        if (timestamp <= cueStart || timestamp >= cueEnd) {\n                            err('Timestamp must be between start timestamp and end timestamp.');\n                        }\n                        if (timestamps.length > 0 && timestamps[timestamps.length - 1] >= timestamp) {\n                            err('Timestamp must be greater than any previous timestamp.');\n                        }\n                        current.children.push({ type: 'timestamp', value: timestamp, parent: current });\n                        timestamps.push(timestamp);\n                    }\n                }\n            }\n            while (current.parent) {\n                if (current.name != 'v') {\n                    err('Required end tag missing.');\n                }\n                current = current.parent;\n            }\n            return removeCycles(result);\n        };\n\n        function nextToken() {\n            var state = 'data',\n                result = '',\n                buffer = '',\n                classes = [];\n            while (line[pos - 1] != undefined || pos == 0) {\n                var c = line[pos];\n                if (state == 'data') {\n                    if (c == '&') {\n                        buffer = c;\n                        state = 'escape';\n                    } else if (c == '<' && result == '') {\n                        state = 'tag';\n                    } else if (c == '<' || c == undefined) {\n                        return ['text', result];\n                    } else {\n                        result += c;\n                    }\n                } else if (state == 'escape') {\n                    if (c == '<' || c == undefined) {\n                        err('Incorrect escape.');\n                        let m;\n                        if ((m = buffer.match(/^&#([0-9]+)$/))) {\n                            result += String.fromCharCode(m[1]);\n                        } else {\n                            if (self.entities[buffer]) {\n                                result += self.entities[buffer];\n                            } else {\n                                result += buffer;\n                            }\n                        }\n                        return ['text', result];\n                    } else if (c == '&') {\n                        err('Incorrect escape.');\n                        result += buffer;\n                        buffer = c;\n                    } else if (/[a-z#0-9]/i.test(c)) {\n                        buffer += c;\n                    } else if (c == ';') {\n                        let m;\n                        if ((m = buffer.match(/^&#(x?[0-9]+)$/))) {\n                            // we prepend \"0\" so that x20 be interpreted as hexadecim (0x20)\n                            result += String.fromCharCode('0' + m[1]);\n                        } else if (self.entities[buffer + c]) {\n                            result += self.entities[buffer + c];\n                        } else if ((m = Object.keys(entities).find((n) => buffer.startsWith(n)))) {\n                            // partial match\n                            result += self.entities[m] + buffer.slice(m.length) + c;\n                        } else {\n                            err('Incorrect escape.');\n                            result += buffer + ';';\n                        }\n                        state = 'data';\n                    } else {\n                        err('Incorrect escape.');\n                        result += buffer + c;\n                        state = 'data';\n                    }\n                } else if (state == 'tag') {\n                    if (c == '\\t' || c == '\\n' || c == '\\f' || c == ' ') {\n                        state = 'start tag annotation';\n                    } else if (c == '.') {\n                        state = 'start tag class';\n                    } else if (c == '/') {\n                        state = 'end tag';\n                    } else if (/\\d/.test(c)) {\n                        result = c;\n                        state = 'timestamp tag';\n                    } else if (c == '>' || c == undefined) {\n                        if (c == '>') {\n                            pos++;\n                        }\n                        return ['start tag', '', [], ''];\n                    } else {\n                        result = c;\n                        state = 'start tag';\n                    }\n                } else if (state == 'start tag') {\n                    if (c == '\\t' || c == '\\f' || c == ' ') {\n                        state = 'start tag annotation';\n                    } else if (c == '\\n') {\n                        buffer = c;\n                        state = 'start tag annotation';\n                    } else if (c == '.') {\n                        state = 'start tag class';\n                    } else if (c == '>' || c == undefined) {\n                        if (c == '>') {\n                            pos++;\n                        }\n                        return ['start tag', result, [], ''];\n                    } else {\n                        result += c;\n                    }\n                } else if (state == 'start tag class') {\n                    if (c == '\\t' || c == '\\f' || c == ' ') {\n                        if (buffer) {\n                            classes.push(buffer);\n                        }\n                        buffer = '';\n                        state = 'start tag annotation';\n                    } else if (c == '\\n') {\n                        if (buffer) {\n                            classes.push(buffer);\n                        }\n                        buffer = c;\n                        state = 'start tag annotation';\n                    } else if (c == '.') {\n                        if (buffer) {\n                            classes.push(buffer);\n                        }\n                        buffer = '';\n                    } else if (c == '>' || c == undefined) {\n                        if (c == '>') {\n                            pos++;\n                        }\n                        if (buffer) {\n                            classes.push(buffer);\n                        }\n                        return ['start tag', result, classes, ''];\n                    } else {\n                        buffer += c;\n                    }\n                } else if (state == 'start tag annotation') {\n                    if (c == '>' || c == undefined) {\n                        if (c == '>') {\n                            pos++;\n                        }\n                        buffer = buffer\n                            .split(/[\\u0020\\t\\f\\r\\n]+/)\n                            .filter(function (item) {\n                                if (item) return true;\n                            })\n                            .join(' ');\n                        return ['start tag', result, classes, buffer];\n                    } else {\n                        buffer += c;\n                    }\n                } else if (state == 'end tag') {\n                    if (c == '>' || c == undefined) {\n                        if (c == '>') {\n                            pos++;\n                        }\n                        return ['end tag', result];\n                    } else {\n                        result += c;\n                    }\n                } else if (state == 'timestamp tag') {\n                    if (c == '>' || c == undefined) {\n                        if (c == '>') {\n                            pos++;\n                        }\n                        return ['timestamp', result];\n                    } else {\n                        result += c;\n                    }\n                } else {\n                    err('Never happens.'); // The joke is it might.\n                }\n                // 8\n                pos++;\n            }\n        }\n    };\n\n    var WebVTTSerializer = function () {\n        function serializeTimestamp(seconds) {\n            const ms = ('00' + (seconds - Math.floor(seconds)).toFixed(3) * 1000).slice(-3);\n            let h = 0,\n                m = 0,\n                s = 0;\n            if (seconds >= 3600) {\n                h = Math.floor(seconds / 3600);\n            }\n            m = Math.floor((seconds - 3600 * h) / 60);\n            s = Math.floor(seconds - 3600 * h - 60 * m);\n            return (h ? h + ':' : '') + ('' + m).padStart(2, '0') + ':' + ('' + s).padStart(2, '0') + '.' + ms;\n        }\n        function serializeCueSettings(cue) {\n            var result = '';\n            const nonDefaultSettings = Object.keys(defaultCueSettings).filter((s) => cue[s] !== defaultCueSettings[s]);\n            if (nonDefaultSettings.includes('direction')) {\n                result += ' vertical:' + cue.direction;\n            }\n            if (nonDefaultSettings.includes('alignment')) {\n                result += ' align:' + cue.alignment;\n            }\n            if (nonDefaultSettings.includes('size')) {\n                result += ' size:' + cue.size + '%';\n            }\n            if (nonDefaultSettings.includes('lineAlign') || nonDefaultSettings.includes('linePosition')) {\n                result +=\n                    ' line:' +\n                    cue.linePosition +\n                    (cue.snapToLines ? '' : '%') +\n                    (cue.lineAlign && cue.lineAlign != defaultCueSettings.lineAlign ? ',' + cue.lineAlign : '');\n            }\n            if (nonDefaultSettings.includes('textPosition') || nonDefaultSettings.includes('positionAlign')) {\n                result +=\n                    ' position:' +\n                    cue.textPosition +\n                    '%' +\n                    (cue.positionAlign && cue.positionAlign !== defaultCueSettings.positionAlign\n                        ? ',' + cue.positionAlign\n                        : '');\n            }\n            return result;\n        }\n        function serializeTree(tree) {\n            var result = '';\n            for (var i = 0; i < tree.length; i++) {\n                var node = tree[i];\n                if (node.type == 'text') {\n                    result += node.value.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');\n                } else if (node.type == 'object') {\n                    result += '<' + node.name;\n                    if (node.classes) {\n                        for (var y = 0; y < node.classes.length; y++) {\n                            result += '.' + node.classes[y];\n                        }\n                    }\n                    if (node.value) {\n                        result += ' ' + node.value;\n                    }\n                    result += '>';\n                    if (node.children) result += serializeTree(node.children);\n                    result += '</' + node.name + '>';\n                } else if (node.type == 'timestamp') {\n                    result += '<' + serializeTimestamp(node.value) + '>';\n                } else {\n                    result += '<' + node.value + '>';\n                }\n            }\n            return result;\n        }\n        function serializeCue(cue) {\n            return (\n                (cue.id !== undefined ? cue.id + '\\n' : '') +\n                serializeTimestamp(cue.startTime) +\n                ' --> ' +\n                serializeTimestamp(cue.endTime) +\n                serializeCueSettings(cue) +\n                '\\n' +\n                serializeTree(cue.tree.children) +\n                '\\n\\n'\n            );\n        }\n        function serializeStyle(style) {\n            return 'STYLE\\n' + style + '\\n\\n';\n        }\n        this.serialize = function (cues, styles) {\n            var result = 'WEBVTT\\n\\n';\n            if (styles) {\n                for (var i = 0; i < styles.length; i++) {\n                    result += serializeStyle(styles[i]);\n                }\n            }\n            for (var i = 0; i < cues.length; i++) {\n                result += serializeCue(cues[i]);\n            }\n            return result;\n        };\n    };\n\n    function exportify(object) {\n        object.WebVTTParser = WebVTTParser;\n        object.WebVTTCueTimingsAndSettingsParser = WebVTTCueTimingsAndSettingsParser;\n        object.WebVTTCueTextParser = WebVTTCueTextParser;\n        object.WebVTTSerializer = WebVTTSerializer;\n    }\n    if (typeof window !== 'undefined') exportify(window);\n    if (typeof exports !== 'undefined') exportify(exports);\n})();\n","exports.interopDefault = function (a) {\n  return a && a.__esModule ? a : {default: a};\n};\n\nexports.defineInteropFlag = function (a) {\n  Object.defineProperty(a, '__esModule', {value: true});\n};\n\nexports.exportAll = function (source, dest) {\n  Object.keys(source).forEach(function (key) {\n    if (\n      key === 'default' ||\n      key === '__esModule' ||\n      Object.prototype.hasOwnProperty.call(dest, key)\n    ) {\n      return;\n    }\n\n    Object.defineProperty(dest, key, {\n      enumerable: true,\n      get: function () {\n        return source[key];\n      },\n    });\n  });\n\n  return dest;\n};\n\nexports.export = function (dest, destName, get) {\n  Object.defineProperty(dest, destName, {\n    enumerable: true,\n    get: get,\n  });\n};\n"],"names":[],"version":3,"file":"index.js.map","sourceRoot":"../../../"}
\ No newline at end of file
diff --git a/packages/artplayer-plugin-multiple-subtitles/package.json b/packages/artplayer-plugin-multiple-subtitles/package.json
index 93f30d1d6..12a04cb96 100644
--- a/packages/artplayer-plugin-multiple-subtitles/package.json
+++ b/packages/artplayer-plugin-multiple-subtitles/package.json
@@ -1,6 +1,6 @@
 {
     "license": "MIT",
-    "version": "1.0.0",
+    "version": "1.1.0",
     "name": "artplayer-plugin-multiple-subtitles",
     "types": "types/artplayer-plugin-multiple-subtitles.d.ts",
     "description": "multiple subtitles plugin for ArtPlayer",
@@ -21,4 +21,4 @@
         "video",
         "player"
     ]
-}
+}
\ No newline at end of file
diff --git a/packages/artplayer-plugin-multiple-subtitles/src/index.js b/packages/artplayer-plugin-multiple-subtitles/src/index.js
index dd03428a3..c87c2de5d 100644
--- a/packages/artplayer-plugin-multiple-subtitles/src/index.js
+++ b/packages/artplayer-plugin-multiple-subtitles/src/index.js
@@ -38,15 +38,7 @@ function mergeTrees(trees) {
             }
         }
 
-        if (result.cues.length === 0) {
-            result.cues = [...tree.cues];
-        } else {
-            for (let l = 0; l < result.cues.length; l++) {
-                const a = result.cues[l].tree.children;
-                const b = tree.cues[l]?.tree?.children;
-                result.cues[l] = { ...result.cues[l], tree: { children: [...a, ...b] } };
-            }
-        }
+        result.cues.push(...tree.cues);
     }
 
     return result;